Consolidated Statements of Stockholders' Equity/Deficit-Unaudited - USD ($) shares in Thousands, $ in Thousands |
Total |
Common Stock |
Additional Paid-In Capital |
Accumulated Deficit |
Accumulated Other Comprehensive Gain (Loss) |
Treasury Stock |
Balance, shares at Dec. 31, 2019 |
|
106,679
|
|
|
|
|
Balance, value at Dec. 31, 2019 |
$ 117,101
|
$ 106
|
$ 1,462,172
|
$ (1,341,444)
|
$ 84
|
$ (3,817)
|
Stock-based compensation |
4,432
|
0
|
4,432
|
0
|
0
|
0
|
Repurchase of common stock |
(923)
|
0
|
0
|
0
|
0
|
(923)
|
Net loss |
|
0
|
0
|
(66,611)
|
0
|
0
|
Unrealized gain on investments |
776
|
$ 0
|
0
|
0
|
776
|
0
|
Balance, shares at Mar. 31, 2020 |
|
107,711
|
|
|
|
|
Balance, value at Mar. 31, 2020 |
54,777
|
$ 108
|
1,466,604
|
(1,408,055)
|
860
|
(4,740)
|
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |
|
1,032
|
|
|
|
|
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture |
2
|
$ 2
|
0
|
0
|
0
|
0
|
Balance, shares at Dec. 31, 2019 |
|
106,679
|
|
|
|
|
Balance, value at Dec. 31, 2019 |
117,101
|
$ 106
|
1,462,172
|
(1,341,444)
|
84
|
(3,817)
|
Net loss |
(53,079)
|
|
|
|
|
|
Unrealized gain on investments |
(49)
|
|
|
|
|
|
Balance, shares at Sep. 30, 2020 |
|
117,231
|
|
|
|
|
Balance, value at Sep. 30, 2020 |
87,639
|
$ 117
|
1,486,853
|
(1,394,523)
|
35
|
(4,843)
|
Balance, shares at Mar. 31, 2020 |
|
107,711
|
|
|
|
|
Balance, value at Mar. 31, 2020 |
54,777
|
$ 108
|
1,466,604
|
(1,408,055)
|
860
|
(4,740)
|
Stock-based compensation |
4,258
|
$ 0
|
4,258
|
0
|
0
|
0
|
Issuance of common stock under Equity Incentive Plans, shares |
|
187
|
|
|
|
|
Issuance of common stock under Equity Incentive Plans, value |
0
|
$ 0
|
0
|
0
|
0
|
0
|
Repurchase of common stock |
(103)
|
0
|
0
|
0
|
0
|
(103)
|
Net loss |
|
0
|
0
|
(69,071)
|
0
|
0
|
Unrealized gain on investments |
(548)
|
$ 0
|
0
|
0
|
(548)
|
0
|
Balance, shares at Jun. 30, 2020 |
|
107,898
|
|
|
|
|
Balance, value at Jun. 30, 2020 |
(10,687)
|
$ 108
|
1,470,862
|
(1,477,126)
|
312
|
(4,843)
|
Stock-based compensation |
1,904
|
$ 0
|
1,904
|
0
|
0
|
0
|
Issuance of common stock under Equity Incentive Plans, shares |
|
9,333
|
|
|
|
|
Issuance of common stock under Equity Incentive Plans, value |
14,096
|
$ 9
|
14,087
|
0
|
0
|
0
|
Net loss |
82,603
|
0
|
0
|
82,603
|
0
|
0
|
Unrealized gain on investments |
(277)
|
$ 0
|
0
|
0
|
(277)
|
0
|
Balance, shares at Sep. 30, 2020 |
|
117,231
|
|
|
|
|
Balance, value at Sep. 30, 2020 |
$ 87,639
|
$ 117
|
1,486,853
|
(1,394,523)
|
35
|
(4,843)
|
Balance, shares at Dec. 31, 2020 |
142,289
|
142,289
|
|
|
|
|
Balance, value at Dec. 31, 2020 |
$ 156,371
|
$ 142
|
1,561,096
|
(1,400,018)
|
(6)
|
(4,843)
|
Stock-based compensation |
2,851
|
$ 0
|
2,851
|
0
|
0
|
0
|
Issuance of common stock under Equity Incentive Plans, shares |
|
2,000
|
|
|
|
|
Issuance of common stock under Equity Incentive Plans, value |
16,399
|
$ 2
|
16,397
|
0
|
0
|
0
|
Repurchase of common stock |
(2,675)
|
0
|
0
|
0
|
0
|
(2,675)
|
Net loss |
(20,958)
|
0
|
0
|
(20,958)
|
0
|
0
|
Unrealized gain on investments |
11
|
$ 0
|
0
|
0
|
11
|
0
|
Balance, shares at Mar. 31, 2021 |
|
145,552
|
|
|
|
|
Balance, value at Mar. 31, 2021 |
152,547
|
$ 145
|
1,580,891
|
(1,420,976)
|
5
|
(7,518)
|
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |
|
1,263
|
|
|
|
|
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture |
$ 548
|
$ 1
|
547
|
0
|
0
|
0
|
Balance, shares at Dec. 31, 2020 |
142,289
|
142,289
|
|
|
|
|
Balance, value at Dec. 31, 2020 |
$ 156,371
|
$ 142
|
1,561,096
|
(1,400,018)
|
(6)
|
(4,843)
|
Net loss |
(62,147)
|
|
|
|
|
|
Unrealized gain on investments |
$ 1
|
|
|
|
|
|
Balance, shares at Sep. 30, 2021 |
149,987
|
149,987
|
|
|
|
|
Balance, value at Sep. 30, 2021 |
$ 136,603
|
$ 150
|
1,606,142
|
(1,462,165)
|
(6)
|
(7,518)
|
Balance, shares at Mar. 31, 2021 |
|
145,552
|
|
|
|
|
Balance, value at Mar. 31, 2021 |
152,547
|
$ 145
|
1,580,891
|
(1,420,976)
|
5
|
(7,518)
|
Stock-based compensation |
$ 2,786
|
0
|
2,786
|
0
|
0
|
0
|
Issuance of common stock under Equity Incentive Plans, shares |
88
|
|
|
|
|
|
Issuance of common stock under Equity Incentive Plans, value |
$ 8
|
1
|
7
|
0
|
0
|
0
|
Payments of Stock Issuance Costs |
31
|
0
|
(31)
|
0
|
0
|
0
|
Net loss |
(18,067)
|
0
|
0
|
(18,067)
|
0
|
0
|
Unrealized gain on investments |
(10)
|
$ 0
|
0
|
0
|
(10)
|
0
|
Balance, shares at Jun. 30, 2021 |
|
145,640
|
|
|
|
|
Balance, value at Jun. 30, 2021 |
137,233
|
$ 146
|
1,583,653
|
(1,439,043)
|
(5)
|
(7,518)
|
Stock-based compensation |
$ 2,712
|
0
|
2,712
|
0
|
0
|
0
|
Issuance of common stock under Equity Incentive Plans, shares |
4,177
|
|
|
|
|
|
Issuance of common stock under Equity Incentive Plans, value |
$ 19,123
|
4
|
19,119
|
0
|
0
|
0
|
Net loss |
(23,122)
|
0
|
0
|
(23,122)
|
0
|
0
|
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax |
|
|
|
|
(1)
|
|
Unrealized gain on investments |
$ 0
|
$ 0
|
0
|
0
|
|
0
|
Balance, shares at Sep. 30, 2021 |
149,987
|
149,987
|
|
|
|
|
Balance, value at Sep. 30, 2021 |
$ 136,603
|
$ 150
|
1,606,142
|
(1,462,165)
|
(6)
|
(7,518)
|
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |
|
170
|
|
|
|
|
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture |
$ 658
|
$ 0
|
$ 658
|
$ 0
|
$ 0
|
$ 0
|